JPH09212963A - Tape cassette positioning structure of tape recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the size of projected part of a positioning and guiding member for correctly setting the tape cassette to the predetermined position within a tape recorder. SOLUTION: A resin center frame 10 is an integrally molded body consisting of an external circumference frame 11 and an internal separation wall 19. The internal separation wall 19 is used as a driving mechanism supporting chassis. A pair of positioning standard rods to be inserted to the position reference hole of a tape cassette are formed as the projected portion in integration with the internal separation wall 19 almost at the right angle attitude. Moreover, a pair of guiding projected piece 19a for correctly guiding the position reference hole to be engaged with the positioning reference rod by leading the side portion of the tape cassette to be loaded is integrated with the center frame 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette positioning structure of a tape recorder having a main exterior body (cabinet) including a rear side box body, a central frame, and a front side tape cassette holding lid, and more particularly to a tape cassette holding structure. The present invention relates to a tape cassette positioning structure when a tape cassette housed in a lid is loaded in a tape recorder body by closing the holding lid.

[0002]

2. Description of the Related Art In this type of tape recorder, a tape drive mechanism component is mounted on a drive mechanism support chassis which is separate from an outer package, and the drive mechanism support chassis is attached to a central frame. The tape drive consists of multiple parts and is treated as a single assembly (block) integral with the drive support chassis. Further, such a tape recorder has a recording / reproducing operation member, a fast-forwarding operation member, a rewinding operation member, and a stop operation member, which are pushed in, as operation mode selection operation members. These operation mode selection operation members are slidably mounted on the drive mechanism supporting chassis together with other drive mechanism components. The recording / reproducing operation member carries a magnetic head, is also supported by the drive mechanism supporting chassis, and is also supported by the drive mechanism supporting chassis.
An oscillating pinch lever carrying a pinch roll is operated. When loading a tape cassette into such a tape recorder, there are the following two methods for correctly setting the tape cassette at a predetermined position in the tape recorder. Positioning is performed in four directions by a fitting engagement relationship between a pair of position reference holes provided in the tape cassette and a pair of positioning reference rods formed to project on the drive mechanism supporting chassis.
This method is used in small models. As shown in FIG. 13, the tape cassette 01 is formed by a pair of guide protrusions formed on the drive mechanism supporting chassis.
Two positions (see arrow 03) on the side edge 02 of the tape cassette are guided and positioned, and the longitudinal positioning of the tape cassette is performed by the fitting / engaging relationship between one positioning reference rod and the position reference hole 04 of the tape cassette. This method is used in large models.

[0003]

When the tape cassette is loaded in the drive mechanism supporting chassis, the capstan and the pair of reel stands (reel drive section pieces) arranged in the drive mechanism supporting chassis are made to correspond to the tape cassette. It is necessary to insert it into each hole. Therefore, when loading the tape cassette, the tape cassette is moved while the position is regulated by the positioning reference rod, or the guide protrusion and the positioning reference rod, but in order to insert the capstan and the pair of reel bases into the respective holes, The length of the positioning reference rod and the guide protrusion must be larger than the length of the capstan and reel stand. This causes problems that the size of the drive mechanism assembly becomes large, the assembly of the operation mode selection operation member to the drive mechanism supporting chassis is hindered, and the largely protruding positioning reference rod and guide protrusion are damaged. . The latter problem is caused by the disadvantage of the long member in terms of strength and the increased chance of collision between members (parts).

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the protruding dimension of a positioning guide member for correctly setting a tape cassette in a predetermined position in the tape recorder when the tape cassette is loaded in the tape recorder. Is.
This object is achieved by employing the following configuration. In a tape recorder having a main exterior body including a rear side box body, a central frame, and a front side tape cassette holding lid, the central frame is made of resin, and an outer peripheral frame and an internal partition wall integrally formed with the outer peripheral frame. The internal partition wall is used as a drive mechanism supporting chassis to support the tape drive mechanism components, and the pair of positioning reference rods fitted into the pair of position reference holes provided in the tape cassette are at a substantially right angle posture. At the center, a pair of guide protrusions are formed to project integrally with the inner partition wall of the central frame, and guide the side of the tape cassette to be loaded to guide the position reference hole so that the position reference hole is correctly fitted to the positioning reference rod. The tape is formed integrally with the frame, and is configured so that the positioning reference rod and the guide protrusion can correctly set the position of the tape cassette. Tape cassette positioning structure of the recorder. In this way, by forming the pair of guide protrusions integrally with the central frame, the tape cassette is guided along the guide protrusions when the tape cassette is loaded so that the position reference holes of the tape cassette are correctly aligned. It can be aligned with the positioning reference rod. With such a structure, the positioning reference rod can be made sufficiently short. When the positioning reference rod is short, the assembly work of the tape drive mechanism parts to the internal partition wall as the drive mechanism support chassis becomes easy, and the positioning at the time of the assembly work is performed in terms of strength and the chance of collision between members (parts). Less damage to the reference rod. If the pair of guide protrusions is formed along the stepped portion between the outer peripheral frame and the inner partition wall in the central frame, it is not necessary to stand the guide protrusions alone on the inner partition wall, and thus the drive mechanism support chassis The shape can be simplified compared to conventional products, it is easy to mold, it can be made into a shape that is not likely to be damaged, and is advantageous in strength. It can be made sufficiently long depending on the size of the stepped portion. The advantages of Also, it is effective to give the positioning reference bar a special shape,
In the side surface of the positioning reference rod facing the side opposite to the side where the pair of guide protrusions are located, a bulging shape is formed between the base and the tip of the positioning reference rod, and the tip and the intermediate bulge are formed. A tape cassette guiding inclined surface is provided between the tape and the projecting portion, and the tape cassette can be prevented from rising after the loading is completed by tilting and retracting from the intermediate bulging portion to the base portion. Normally, the loaded tape cassette is spring-biased on the side opposite to the tape running side, and if this tape cassette is pressed against the base of the tilted and retracted positioning reference rod, the above-mentioned floating Preventive effect is obtained. Furthermore, it is preferable that the central frame is made of ABS resin or AS resin having high strength and good transfer rate of the mold surface. Hereinafter, an embodiment of the present invention will be described. In this specification, the terms take-up reel and supply reel are used, but this is a convenient name based on the recording / reproducing operation or the fast-forward operation, and the take-up reel is used during the rewinding operation. , The supply reel
They function as the tape supply side and the tape winding side, respectively. Further, the tape recorder of the present embodiment has recording / reproducing, fast-forwarding, and rewinding functions, but does not have a recording function.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view of a drive mechanism component of a tape recorder as viewed from the tape cassette mounting side (this is referred to as the front side in this specification). FIG. 1 does not show the entire exterior body (cabinet), but only a central frame 10, which is a part thereof. In FIG. 1, a tape cassette holding lid (not shown) is attached to the front side of the central frame 10 so as to be openable / closable by a hinge method as well known, and a back side box body (not shown) is attached to the back side. The central frame 10 is an integral resin molded product (eg, ABS) mainly including an outer peripheral frame 11 and an internal partition wall 19.
Resin, AS resin, mixed resin of ABS and AS, etc.). The internal partition wall 19 is used as a drive mechanism supporting chassis, and has a recording / reproducing operation member 30 (FIG. 1) as an operation mode selection operation member, a fast-forward operation member 40 (FIG. 3), a rewind operation member 50 (FIG. 3), and a stop. Operating member 60
(FIG. 3) and other tape drive components. These tape drive mechanism parts are
Most of the other tape drive mechanism parts including the fast-forwarding operation member 40, the rewinding operation member 50, and the stop operation member 60 are arranged on the front and back sides of the recording and reproducing operation member 30 on the front side.
It is disposed on the back side, that is, the back side of the internal partition wall 19 shown in FIG. The recording / reproducing operation member 30, the fast-forwarding operation member 40, and the rewinding operation member 5 which are operation mode selection operation members.
0 and the stop operating member 60 are both shown in FIGS. 1 and 3 in the non-operation standby position. Each of these members is a substantially flat body, and is slidably supported by a plurality of guide protrusions that are appropriately provided on the inner partition wall 19. Each of the biasing springs S1, S2, and S3 described below is supported. It is pushed in the direction of arrow A against the urging force of A and is moved forward, and moves from the pushing operation position in the direction of arrow B according to the urging forces of the urging springs S1, S2, S3, and returns to the standby position.

Further, an operation member holding plate 70, which is a member for holding the recording / reproducing operation member 30, the fast-forwarding operation member 40, and the rewinding operation member 50 at their forward movement positions, is appropriately provided on the internal partition wall 19 so as to project. It is slidably supported by a plurality of guide protrusions (Fig. 3). The operation member holding plate 70 is a member that moves in a direction transverse to the moving direction of each operation mode selection operation member and the stop operation member 60. This operation member holding plate 70 is interlocked with each operation mode selection operation member and stop operation member 60, is moved in the direction of arrow C against the urging force of the urging spring S2 described later, and selects each operation mode at its forward position. The operating member is held in the push-in operation position and also held in the forward movement position. This holding state is canceled by the movement of the stop operation member 60, moves from the forward movement position in the direction of arrow D according to the urging force of the urging spring S2, and returns to the standby position. The operation member holding plate 70 is a switch actuator that opens and closes the switch 80 of the magnetic tape drive motor. The motor switch 80 is disposed on the inner partition wall 19 on the back side, and is closed (ON) by the movement of the operation member holding plate 70 in the direction of arrow C (FIG. 3) and in the direction of arrow D (FIG. 3). It is opened (OFF) by the movement of the operation member holding plate 70 toward. As will be described later, the motor switch 80 is also opened by the stop operating member 60.

On the back side of the internal partition wall 19 (driving mechanism supporting chassis), a tape driving mechanism component is arranged together with the fast-forwarding operation member 40 and the rewinding operation member 50 (see FIG. 7). Is arranged on the back side of the inner partition wall together with the operation mode selection operation member and the stop operation member. However, when these drive mechanism parts are shown in FIGS. 3, 5 and 6, many lines are complicated and the drawing is read. Only the drive mechanism components are shown in FIG. 7 for simplicity). At positions where the support shaft of the tape drive mechanism component, the operation mode selection operation member, and the stop operation member interfere with each other, openings (windows) are appropriately formed in the members. Are largely omitted. The tape drive mechanism component is a magnetic tape drive motor 90, a drive pulley 91 fixed to the rotor shaft of the motor 90, a capstan 93, the same member as the capstan 93, and penetrating the internal partition wall 19. A driven pulley 95 fixed to a capstan shaft 94 extending to the opposite side (back side), a capstan gear 96 integral with the driven pulley 95, a drive belt 92 stretched over both pulleys 91, 95, a cap. A first intermediate gear member 97 that meshes with the stun gear 96, a take-up reel drive gear 100 that meshes with the first intermediate gear member 97, a second intermediate gear member 101 that selectively meshes with the first intermediate gear member 97, And a supply reel drive gear 104 that meshes with the second intermediate gear member 101. There may be other relay gears between the first intermediate gear and the pre-take reel and between the second intermediate gear and the supply reel drive gear. Take-up reel drive gear 10
The take-up reel shaft that integrally supports 0 extends through the inner partition wall 19 to the opposite side (front side) from the take-up reel drive gear 100 and engages with the reel hub of the tape cassette. 106 is held so that it cannot rotate relative to it. Further, the supply reel drive part 105 that engages with the reel hub of the tape cassette is formed in a hexagonal shape, and the base part integrated with this is formed in a tubular shape, and is formed as a resin molded product integrated with the supply reel drive gear 104. There is. The supply reel drive gear 104 and the supply reel drive part 105, which are an integrated product, are provided on a bottom wall of a circular recess 20 that is formed so as to recede from the front side of the internal partition wall 19 toward the rear side, and extend to the front side. The supply reel drive gear 104, which is rotatably supported by the shaft, faces the rear side of the internal partition wall 19 through the windows 20b formed in the bottom wall and the side wall of the recess 20 formed in a cutout shape. The piece 105 projects to the front side of the internal partition wall 19 similarly to the take-up reel drive section piece 106.

Next, the central frame, each operation mode selecting operation member, the magnetic tape drive motor switch, and the magnetic tape drive mechanism will be individually described. Central Frame 10 The central frame 10 is a resin integrally molded product, and has an outer peripheral frame 11 and an internal partition wall 19 (FIG. 1). A front side region of the outer peripheral frame 11 that is continuous with the top wall 12 on the side where the manual operation crown (head) of each operation mode selection operation member is located is formed as a raised wall 14 raised from the front side surface of the internal partition wall 19. ing. Tape cassette guide ridge 17: The recessed window portion 1 formed in the step portion 15 between the raised wall 14 and the internal partition wall 19.
A pair of tape cassette guide ridges 17 are formed on the step portion 15 on both sides of the protrusion 6. Positioning reference rods 18: A pair of positioning reference rods 18 are provided on the front side of the internal partition wall 19 so as to correspond to the window portions 16 of the step portion 15. The positioning reference rod 18 cooperates with the guide ridge 17 by being engaged with a pair of position reference holes provided in the tape cassette to guide the tape cassette mounted in the tape recorder to the correct position. The shape of the positioning reference rod 18 is, as shown in FIG. 2, on the side surface facing the side opposite to the side on which the guide protrusion 17 is located,
A bulging shape 1 is formed between the base portion and the tip of the positioning reference rod 18.
8b, and a tape cassette guiding inclined surface 18a is formed between the tip and the intermediate bulging portion 18b.
The tape cassette 8 is inclined and retracted (18c) from 8b to the base portion, thereby preventing the tape cassette from being lifted after the completion of loading. Bearing holding sleeve 21 and bearing bush 22 for supporting capstan: A bearing bush 22 made of resin for supporting capstan (preferably polyacetal resin) is received and held at a position near one of the pair of positioning reference rods 18. The bearing holding sleeve 21 is formed integrally with the inner partition wall 19 so as to project to the front and back sides of the inner partition wall 19 (both ends of the bearing support opening extend in a sleeve shape) (FIGS. 10 and 11). , FIG. 12). The bearing bush 22 is
The two ends are securely held in the bearing holding sleeve 21 in a press-fitting relationship, but there is a gap between the bearing holding sleeve 21 and the inner wall surface of the bearing holding sleeve 21 in the intermediate part except the both ends. Further, both end portions of the bearing bush 22 are reduced in diameter due to the press-fitting tight fitting relationship with the bearing holding sleeve 21, so that the inner diameter of the intermediate barrel portion becomes relatively large, and this intermediate large diameter portion is the capstan shaft. It is a suitable lubricant reservoir in relation to 94. Further, the bearing bush 22 is press-fitted and fixed in a posture in which the bearing bush 22 is slightly inclined with respect to the axis of the bearing holding sleeve 21, and the inclination is such that a pinch described below is provided from the base of the capstan 93 supported by the bearing bush 22 toward the tip. The inclination is such that it gradually approaches the roller 39 side at a slight angle. This is because the traveling magnetic tape is reliably sandwiched between the capstan 93 and the pinch roller 39 to ensure stable traveling.
In addition, the bearing bush 22 press-fitted into the bearing holding sleeve 21 has a pair of locking pieces (two-forked shape pieces) that face each other at the ends that penetrate the inner partition wall 19 and extend to the front side.
23. Each locking piece 23 has its tip bending jaw (protrusion) 23a snap-on type (after being elastically deformed and then expanded into an outer peripheral annular groove formed at a corresponding position of the capstan 93, to its original shape). The projections and recesses are engaged back to prevent the capstan 93 from moving axially by engaging the projections, which typically make a clicking sound when engaged.

Operation mode selection operation member and operation member storage
Holding plate 70 Recording / reproducing operation member 30:
The base body that supports the magnetic head 38 and the pinch roller 39 is a resin integrally molded product (FIG. 1). Polyacetal is suitable as the resin material. Unlike the other operation mode selection operation members and the magnetic tape drive mechanism component, the operation member 30 is slidably disposed on the front surface of the internal partition wall 19, and the manual operation head 31, which is a part of the base body, is provided. ,
It projects to the outside through a cutout portion (opening) 13 formed on the top wall 12 of the outer peripheral frame 11. Operation member 30
The sliding displacement of is guaranteed by the plurality of guide protrusions provided on the inner partition wall 19. The operation member 30 includes the internal partition 19
Of the supply reel driving part 105 and the take-up reel driving part 106 projecting from the front surface of the device, advances from the initial standby position (direction of arrow A) and from the advanced position to standby position (direction of arrow B). It is possible to return to. This forward movement is performed against the biasing force of the torsion coil spring S1, and the return is performed by the elastic restoring force of the torsion coil spring S1. That is, the operating member 30 is constantly urged in the outward projecting direction (direction of arrow B in FIG. 1) in the engagement relationship with the torsion coil spring S1 arranged along the rear surface of the internal partition wall 19, The initial standby position is maintained due to the engagement relationship with the plurality of protruding pieces provided on the inner partition wall 19. Engagement with the torsion coil spring S1 is performed by the protrusion 36 projectingly formed on the back surface side of the operating member 30 projecting to the back surface side of the internal partition wall 19 through the opening formed in the internal partition wall 19. The projecting piece 36 is located near one side (the right side in FIG. 1) of the operating member 30. On the other hand, the protrusion 36
A pinch roller 39 is arranged at a position near the other side (left side in FIG. 1) of the operation member 30 on the side opposite to. Further, the operation member 30 is the rubber pinch roller 3
In addition to a support bracket (projection piece) 32 that rotatably supports 9, a locking projection piece 33 that is provided at a substantially central position on the rear surface of the operating member 30, and a pair of magnetic tape guide pieces 3.
4a and 34b. This magnetic tape guide piece 34a,
One guide piece 34a of the support bracket 3
It is a member branched from 2. A part of the side surface of the locking projection 33 opposite to the manual operation head 31 (arrow A side) is formed as an inclined surface 33a, and when the operation member 30 is pushed in and moves forward, the inclined surface 33a is formed. 33a contacts a part of the operation member holding plate 70 and pushes it, so that the operation member holding plate 70 is transverse to the forward direction of the operation member 30.
Is displaced, and at the end, it engages with a part of the operation member holding plate 70 and restrains each other, so that the displacement positions of both members 30, 70 are maintained. A pinch roller 39 that is pressed against the capstan 93 when the operation member 30 advances.
Is supported by a support bracket 32 so as to freely rotate around an axis that is substantially perpendicular to the front surface of each of the internal partition wall 19 and the operating member 30. The magnetic head 38 is screwed and fixed to the front surface of the operating member 30, and its mounting position substantially corresponds to the position of the locking projection 33 on the back side of the operating member 30 (generally back-to-back position). Further, in the side portion on the side where the projecting piece 36 is located, the operating member 30 extends the longest toward the forward side (in the direction of arrow A), and the extended distal end portion thereof has an open leg shape that is a spring-like pressing piece. The bifurcated body 35 is formed to extend.
The bifurcated body 35 is formed as a bent strip having a relatively small diameter, and when the operating member 30 is at the standby position, the supply reel drive part piece 105 having a hexagonal outer peripheral surface 105.
When the operating member 30 is located at the forward position and is separated from the cylindrical base portion, it is expanded and elastically deformed in such a manner that it is pressed against the cylindrical base portion of the supply reel drive part 105 to sandwich the cylindrical base portion (FIG. 4). Further, the operation member 30 has an opening 37 near the bifurcated body 35. This opening 37 is a forked body 35.
Has a narrow end on the side where the
The end on the side of is wide. Internal partition 19
The hook-shaped locking projection 19a formed on the front side of the
And the posture of the operating member 30 is maintained and the posture thereof is maintained. The locking relationship between the locking projection 19a and the opening 37 is such that when the operating member 30 is at the standby position, the locking projection 19a is located at the narrow end of the opening 37 and the operating member 30 is at the forward position. Occasionally, the locking projection 19a is located in a relatively wide area between the narrow end and the wide end.

Fast-forwarding operation member 40: The fast-forwarding operation member 40 is a resin integrally molded product. Polyacetal is suitable as the resin material. The fast-forwarding operation member 40 is in parallel relationship with the rewinding operation member 50, the stop operation member 60, and the operation member holding plate 70 on the back surface side of the internal partition wall 19 and is slidably displaced along the back surface of the internal partition wall 19. It is possible (Fig. 3). This sliding displacement is performed in a direction parallel to the moving direction of the recording / reproducing operation member 30, and is ensured by a plurality of guide protrusions provided on the internal partition wall 19. It should be noted that the fast-forwarding operation member 40 is arranged on the rightmost side of the inner partition wall 19 from the rear side, the stop operation member 60 is arranged on the leftmost side, and the rewinding operation member 50 is arranged between both members 40, 60. There is. A manual operation head 41, which is a part of the base of the operation member 40, projects to the outside through a cutout portion (opening) 13 formed in the top wall 12 of the outer peripheral frame 11. Further, the operating member 40 is branched into two forks on the pushing forward side, the end edge of the first branch leg 42 is made into an inclined surface 42a, and further, a projecting portion 42b forming a part of the inclined surface 42a. , A recess 42c retracted from the tip edge of the protruding portion 42b is provided in the first branch leg 42, and the inclined surface 42a is pushed in an engaging contact relationship with the projecting piece 73 of the operation member holding plate 70. Advance of the operation member 40,
The operation member holding plate 70 is displaced in the direction of arrow C, which is a direction transverse to the backward direction. The second branch leg 43 has a protruding piece 4 on the surface not facing the internal partition wall 19.
3a, and a torsion coil spring S2 for biasing the projecting piece 43a.
Has one end engaged. This torsion coil spring S2 is
The coil center is supported by a supporting piece protruding from the rear surface of the internal partition wall 19, and the other end is engaged with a protruding piece 71 protruding from one end of the operation member holding plate 70. The torsion coil spring S2 keeps the operating member 40 at the initial standby position side (arrow B).
Direction).

Rewinding operation member 50: The rewinding operation member 50 is a resin integrally molded product. Polyacetal is suitable as the resin material. The operation member 50 is in parallel relationship with the fast-forward operation member 40 and the stop operation member 60 on the back surface side of the internal partition wall 19 and the internal partition wall 19 is formed.
It is arranged so as to be slidable along the rear surface of the (Fig. 3). This sliding displacement is guaranteed by a plurality of guide protrusions provided on the inner partition wall 19, and the recording / reproducing operation member 30 is secured.
It is performed in a direction parallel to the moving direction of. In the operation member 50, the manual operation head 51, which is a part of the base body, has the outer peripheral frame 1.
It projects to the outside through a cutout portion (opening) 13 formed in the top wall 12 of No. 1. Further, the operating member 50 extends sufficiently long toward the pushing forward side (the direction of arrow A), but the extended portion has a shape that deflects in the transverse direction to the side where the stop operating member 60 is located (the direction of arrow D). Has been done. The operation member 50 has a bifurcated shape at the deflected distal end portion. This bifurcated shape has the first branch piece 52, the second
It consists of a branch piece 53, the second branch piece 53 forms the most distal end of the operating member 50, the first branch piece 52 is located on the side of the manual operation head 51 with respect to the second branch piece 53, and stops in the transverse direction. It is deviated to the operation member 60 side. The first branch piece 52 and the second branch piece 53 are the first branch piece 53, as will be described later.
This is a member for displacing the intermediate gear member 97. Further, on the side close to the first branch piece 52, between the first branch piece 52 and the manual operation head 51, a hook-shaped locking projection 54 is provided on the surface of the operation member 50 on the side facing the internal partition wall 19. Is projected. When the operating member 50 is pushed in and moves forward, the locking projection 54 contacts a part of the operating member holding plate 70 and pushes it, so that the operating member holding plate is held in a direction transverse to the forward direction of the operating member 50. The plate 70 is displaced, and finally, a part of the operation member holding plate 70 is engaged and restrained from each other,
The displacement positions of both members 50 and 70 are maintained. Further, the operation member 50 has a protrusion 55 on the surface not facing the internal partition wall 19 at an intermediate position between the area of the manually operated head 51 and the areas of the first branch piece 52 and the second branch piece 53. A torsion coil spring S3 for urging the protrusion 55
Has one end engaged. The torsion coil spring S3 is
The coil center is supported by a support piece projecting from the rear surface of the internal partition wall 19, and the other end is engaged with the projection piece 62 of the stop operating member 60. The torsion coil spring S3 constantly biases the operating member 50 and the stop operating member 60 toward the initial standby position side (direction of arrow B).

Stop operating member 60: Stop operating member 60
Is a resin integrally molded product. Polyacetal is suitable as the resin material. The operation member 60 is a member for canceling the operation of the tape recorder selected by the other operation mode selection operation members 30, 40, 50, and the operation members 30, 40, 50 that have been pushed in are in standby positions. It has a function to return to. The operation member 60 is arranged in parallel with the operation members 40 and 50 on the back surface side of the internal partition wall 19 and is slidably displaced along the back surface of the internal partition wall 19 (FIG. 3). ). This sliding displacement is ensured by a plurality of protrusions provided on the internal partition wall 19 and is performed in a direction parallel to the recording / reproducing operation member 30. The manual operation head 61, which is a part of the base of the operation member 60, projects to the outside through a cutout portion (opening) 13 formed in the top wall 12 of the outer peripheral frame 11.
The operation member 60 is pushed forward (in the direction of arrow A).
It has legs 62 extending sufficiently toward This leg 6
The tip 63 of 2 functions as the opening means of the motor switch 80. Further, at a position closer to the base of the leg 62 than the tip 63, a protrusion 64 protruding toward the internal partition wall 19 is provided on the step-shaped side portion. This projection 64 is a means for acting on the operating member holding plate 70 and moving it in the transverse direction. It should be noted that the operation mode selection operation member 30,
Either 40 or 50 already crosses (arrow D
Direction: Operating member holding plate 7 displaced in FIG. 5)
When the protrusion 64 pushes 0, the operating member holding plate 70 further moves in the displaced direction (direction of arrow D) against the biasing force of the torsion coil spring S2, and the operating member holding plate 70 and the operating member holding plate 70 are in the forward position. That is, the constraint relationship with the operation mode selection operation member is broken, and the corresponding operation mode selection operation member returns to the standby position. Further, the operating member 60 has a projecting piece 65 on the surface not facing the inner partition wall 19, and one end of the biasing torsion coil spring S3 is engaged with the projecting piece 65. As described above, the torsion coil spring S3 always biases the stop operating member 60 and the rewinding operating member 50 toward the initial standby position side (direction of arrow B).

Operation Member Holding Plate 70: The operation member holding plate 70 is a resin integrally molded product. Polyacetal is suitable as the resin material. The operation member holding plate 70 is positioned between the fast-forward operation member 40, the rewind operation member 50, the stop operation member 60, and the internal partition wall 19 (FIG. 3). Further, the operation member holding plate 70 is slidably displaced along the rear surface of the internal partition wall 19 in a direction transverse to the moving direction of the operation mode selection operation members 30, 40, 50. This sliding displacement is ensured by a plurality of guide protrusions provided on the inner partition wall 19. The operation member holding plate 70 has a function of restraining and holding the recording / reproducing operation member 30, the fast-forwarding operation member 40, and the rewinding operation member 50, and also cancels the restraint-holding relationship by a cooperative action with the stop operation member 60. It also has a function of opening and closing the motor switch 80 of the magnetic tape drive motor. First, in relation to the locking projection 33 of the recording / reproducing operation member 30, the central frame 10 is at a substantially intermediate position of the length of the operation member holding plate 70 in the longitudinal direction (movement displacement direction of the operation member holding plate 70). The operation member holding plate includes an inclined surface 72a formed on a side portion near the top wall 12, a protruding portion 72b forming a part of the inclined surface 72a, and a recess 72c retracted from the tip edge of the protruding portion 72b. 70 is formed. The locking protrusion 33 of the recording / reproducing operation member 30 is
After pressing the inclined surface 72a with the inclined surface 33a, the protrusion 7
2b is crossed, the hook-shaped portion 33b is engaged with the recess 72c, the two members 30, 70 are restrained from each other, and the state is maintained. In relation to the fast-forwarding operation member 40, the locking projection 73 that comes into contact with the inclined surface 42a of the first branch leg 42, the projection 42b, and the recess 42c retracted from the tip edge of the projection 42b is at the center. It is provided so as to protrude from the side wall of the operation member holding plate 70 near the top wall 12 of the frame 10. The protruding direction of the locking projection 73 is a direction away from the rear surface of the internal partition wall 19. Further, in relation to the rewinding operation member 50, at the position corresponding to the hook-shaped locking protrusion 54,
A relatively large opening 74 is formed near the top wall 12 of the central frame 10 at a side portion of the operation member holding plate 70, and a part of an inner peripheral edge of the opening 74 is brought into contact with the locking projection 54. An inclined surface 74a, a protrusion 74b, and a recess 74c that is recessed from the tip edge of the protrusion 74b are formed. After pressing the inclined surface 74a, the locking projection 54 of the rewinding operation member 50 gets over the projection 74b, and the hook-shaped portion of the locking projection 54 engages with the recess 74c to allow the members 50, 70 to be joined. Bind to each other and maintain that state. In addition, in relation to the motor switch 80, the operation member holding plate 70 has the opening 7
4 has a bent leg 75 that extends further in the direction opposite to the end (direction of arrow D) where the protruding piece 71 that engages with the torsion spring S2 exists and in the direction of arrow A. The leg 75 extends in the region of the motor switch 80 through a space between the stop operating member 60 and the internal partition wall 19. An arrow D is formed on the surface of the leg 75 on the side not facing the internal partition wall 19.
A switch activation protrusion 75a located at the tip of the side, a small protrusion 75b and an elongated protrusion 75c located closer to the opening 74 than the switch activation protrusion 75a are formed to project.
The small protrusions 75b and the elongated protrusions 75c are members that come into contact with and engage with the protrusions 64 of the stop operating member 60, and are arranged in such a positional relationship that the protrusions 64 contact the former and then the latter. Any operation mode selection operation member 30, 4
When the stop operating member 60 is pushed in and the protrusion 64 moves forward in a state in which 0 and 50 are pushed in, the operation is performed by contacting the inclined surface of the small projecting piece 75b (inclining upward to the right in FIG. 3). The member holding plate 70 is slightly pushed in the direction of the arrow C, and after overcoming the small projecting piece 75b, the elongated projecting piece 75 is immediately pushed.
When the stop operating member 60 is pushed back by the urging force of the torsion coil spring S3, the protrusion 64 causes the small protrusion along the inclined face of the elongated protrusion 75c to come into contact with the inclined face of c (the upward slope in FIG. 3). It returns to the initial position by passing between the piece 75b and the elongated protrusion 75c.

The motor switch 80 is disposed on the rear surface of the internal partition wall 19 in such a manner that the switch 75 of the magnetic tape drive motor 80 overlaps with the range in which the leg 75 is reciprocally displaced (FIG. 3). The switch 80 includes a switch base portion 81 made of an insulating material and protruding from the inner partition wall 19, a pair of conductive material spring lead plates (contact support members) 82 and 83 extending from the inside of the switch base portion 81. Lead plate 82,
Contact points 82a, 83a attached to the facing surfaces of 83 and capable of contacting and separating from each other, and a switch base 81 rather than the contact point 82a
The switch follower piece 82b made of an insulating material is attached to the lead plate 82 at a position closer to it. The lead plates 82 and 83 are connected to a power supply side wiring (not shown) through the inside of the switch base 81. Further, the lead plates 82 and 83 are parallel to each other with a small space therebetween, pass over the leg 75 (upper direction in the direction perpendicular to the paper surface in FIG. 3), and extend in an inclined posture. The lengths of the lead plates 82 and 83 are different from each other, and the lead plate 83 extends beyond the position of its contact point 83a so that when the stop operating member 60 advances, it is pushed and bent by the tip of the stop operating member 60. Has become. Further, the switch follower piece 82b is pushed and moved in a contact relationship with the switch activation protrusion 75a of the operation member holding plate 70,
The lead plate 82 bends so that the contacts 82a and 83a come into contact with each other, so that the switch 80 is closed.

Each component constituting the magnetic tape drive mechanism drive mechanism has been briefly described above. Therefore, here, the arrangement mode of each component and the mutual relationship will be described (FIGS. 7, 8, and 9). Capstan 93: The capstan 93 protruding to the front side of the inner partition wall 19 is a metal rod material, and the metal rod material penetrates the resin bearing bush 22 press-fitted and fixed in the bearing holding sleeve 21 of the inner partition wall 19. The portion of the inner partition wall 19 that projects to the back side is the capstan shaft 94. The capstan shaft 94 is rotatably supported by the bearing bush 22. The capstan shaft 94 projects to the back side of the internal partition wall 19 and near the locking projection 73, the operation member holding plate 70.
Since it penetrates through an opening (not shown) formed in, the movement of the operation member holding plate 70 in the transverse direction is not hindered. A pinch roller 39 is pressed against the capstan 93 by a pressing operation of the recording / reproducing operation member 30 via a magnetic tape.

Capstan gear 96, driven pulley 9
5: A driven pulley 95 and a capstan gear 96, which are integrally molded products made of resin, are supported by a capstan shaft 94 projecting to the back side of the internal partition wall 19 so as not to rotate relative to each other. Polyacetal is suitable as the resin material.
The capstan gear 96 is a helical gear, and is located closer to the rear surface of the internal partition wall 19 than the driven pulley 95. A magnetic tape drive motor 90 is disposed on the rear surface of the internal partition wall 19 at a position further away from the top wall 12 of the central frame 10 than the capstan shaft 94, and the rotor of the motor 90 is disposed. A drive belt 92 is wound around a drive pulley 91 and a driven pulley 95 that are supported by a shaft so that they cannot rotate relative to each other.

First intermediate gear member 97: A support shaft 97A integrally provided on the rear surface of the internal partition wall 19 at a right angle.
A first intermediate gear member 97 is rotatably supported and is axially displaceable. The first intermediate gear member 97 is a two-stage gear as a resin integrally molded product (preferably polyacetal), and has a large helical gear 98 and an internal partition wall 19.
Side small gear 99. The large-diameter helical gear 98 is
It constantly meshes with a helical gear capstan gear 96 having a smaller diameter than this so as to be axially displaceable. The gear teeth of the large diameter gear 98 start from the surface on the side opposite to the small diameter gear 99.
It is inclined toward the front side (see the arrow indicating the rotation direction in FIGS. 7 and 8) toward the 9 side. Correspondingly,
The gear teeth of the capstan gear 96 are inclined from the driven pulley 95 side toward the front side (see the arrow indicating the rotation direction in FIG. 7) toward the side facing the rear surface of the internal partition wall 19.

Means for displacing the first intermediate gear member 97 in the axial direction: The first intermediate gear member 97 is reciprocally displaced along the support shaft 97A by the cooperative action of the rewinding operation member 50 and the swing arm 108. . The swing arm 108 is an integral resin molded product (polyacetal is suitable), and the tip end portion of the rewinding operation member 50 (from the manual operation head 51 portion,
It is located at a position where it can be engaged with a portion (extending most beyond the operation member holding plate 70), and is arranged substantially parallel to the operation member holding plate 70 as a whole with reference to the length direction.
The swing arm 108 is arranged at a slight distance from the rear surface of the internal partition wall 19, and is projected on the internal partition wall 19 at the brackets 108a and 108b which are projected on both sides thereof. Support shaft 107 attached to a pair of support protrusions 19b
A and 107B are supported by the support shaft 107.
A and 107B can be swung in the directions of separating and approaching the internal partition wall 19 with the swing center as the swing center. Rewind operation member 5
The part that can be engaged with the front end portion of 0 is the base region 108c near the brackets 108a and 108b of the swing arm 108. As described above, the rewinding operation member 50 has a bifurcated first branch piece 52 and a second branch piece 53 at the tip thereof.
Having. When the rewinding operation member 50 moves forward by the pushing operation, the first branch piece 52 rides on the upper surface (the side not facing the rear surface of the internal partition wall 19) of the base region 108c of the swing arm 108. The lower surface of the first branch piece 52 (the side facing the rear surface of the internal partition wall 19) is an inclined surface, and the first branch piece 52 moves forward to climb on the base region 108c of the swing arm 108. Accordingly, the base region 10
8c approaches the inner partition wall 19 side, and the supporting shafts 107A, 107
The swing arm 108 swings around B as the swing center, and the tip portion on the side opposite to the base region 108c is lifted (FIG. 9). In addition, the second branch piece 53 includes the base region 108 of the swing arm 108.
c and the internal partition wall 19 are advanced and retracted, and when the rewinding operation member 50 is retracted and is in the standby position, it contacts the lower surface of the base region 108c (the side facing the rear surface of the internal partition wall 19). Thus, the swing arm 108 is kept in the parallel posture (FIG. 8). The second branch piece 53 is located at a position beyond the base region 108c in the state where the rewind operation member 50 is advanced, and is formed on a part of the upper surface of the second branch piece 53 when the rewind operation member 50 is retracted. The lower surface of the swing arm 108 is pushed by the inclined surface, and the tilted swing arm 108 is gradually returned to the parallel posture. The tip portion of the swing arm 108 has a support shaft 9 of the first intermediate gear member 97.
The first arm 10 has a bifurcated shape to avoid 7A and is bent
8d and the second arm 108e. On the side of the first arm 108d facing the internal partition wall 19 (the lower surface side), a projecting piece 108f is provided so as to project inside the swinging arm 108 in a state parallel to the internal partition wall 19. It is adapted to come into contact with the partition wall 19. In addition, the swing arm 108 is approximately at the intermediate position between the protrusion 108f and the brackets 108a and 108b.
Similarly, a hook-shaped locking piece 108g is projectingly provided on the lower surface side. The internal partition 19 is associated with the hook-shaped locking piece 108g.
A hook-shaped stopper protrusion 19c is provided on the rear surface of the
The swing arm 108 swings from the parallel posture so that the first intermediate gear member 97 is moved by the first arm 108d and the second arm 108e at the tip.
When the hook is lifted, the hook-shaped locking piece 108g engages with the hook-shaped portion of the hook-shaped stopper projection piece 19c, and the swing arm 108g.
The upper limit position of rocking is defined. As a result, the first intermediate gear member 97 stops at the predetermined lifting position, and the large helical gear 98 of the second intermediate gear member 101 of the second intermediate gear member 101 has the large helical gear 1 of the second intermediate gear member 101.
Mesh with 02.

Take-up reel drive gear 100: The take-up reel drive gear 100 is a resin molded product (preferably polyacetal), which passes through the internal partition wall 19 and is rotatably supported by the internal partition wall 19. The small shaft gear 99 of the first intermediate gear member 97, which is supported by the reel shaft so as not to be displaceable in the axial direction and not relatively rotatable, and displaceable in the axial direction, is disengageably engaged with the small diameter gear 99. On the take-up reel shaft extending to the front side of the internal partition wall 19, a take-up reel driving piece 106 that engages with the reel hub of the tape cassette is supported so as not to be able to rotate relatively.

Second intermediate gear member 101: internal partition wall 1
A support shaft 10 integrally projecting from the rear surface of 9 at a right angle.
The first intermediate gear member 101 is rotatably supported by the shaft 1A so as not to be displaced in the axial direction. Second intermediate gear member 1
Reference numeral 01 denotes a two-stage gear as a resin integrally molded product (preferably polyacetal), which is a large-diameter helical gear 102.
And a small-diameter gear 103 on the inner partition wall 19 side. First
The large helical gear 102 having a smaller diameter than the large helical gear 98 of the intermediate gear member 97 is disengageably meshed with the large helical gear 98 which is axially displaceable. Large diameter gear 1
The gear teeth of No. 02 are inclined toward the front side of rotation (see the arrow indicating the rotation direction in FIG. 9) from the surface opposite to the small gear 103 toward the small diameter gear 103 side (FIG. 8).

Supply reel drive gear 104: The supply reel drive gear 104 that constantly meshes with the small-diameter gear 103 of the second intermediate gear member 101 is a resin molded product that is integral with the supply reel drive part 105 that engages with the reel hub of the tape cassette. Is formed as. Polyacetal is suitable as the resin material. As described above, the supply reel drive gear 104 and the supply reel drive part piece 105, which are an integrated product,
Is rotatably supported by a support shaft that is provided on a bottom wall 20a of a recess 20 that is formed so as to recede from the front side of the internal partition wall 19 toward the rear side, and that extends toward the front side.
4 faces the back side of the internal partition wall 19 through the side wall of the recess 20 in which the window 20b is formed in a cutout shape, and the supply reel drive part 105 is similar to the take-up reel drive part 106 in the internal partition wall 19. It protrudes to the front side.

Hereinafter, the operation of this embodiment will be described. Recording / reproducing operation: A tape cassette mounted on a tape cassette holding lid (not shown) is set to a predetermined position by closing the tape cassette holding lid with respect to the cabinet body (center frame 10).
At that time, the corresponding side edges of the tape cassette are guided by the pair of guide ridges 17 having the guide inclined surface, and the pair of reference holes of the tape cassette are erected on the inner partition wall. Are engaged (fitted) respectively. The tape cassette is positioned and set at the correct position of the central frame 10 by the engagement relationship thereof. In this setting state, a part of the inner peripheral edge of the reference hole is located in the inclined retreat portion 18c of the guide rod 18, and the intermediate bulging portion 18b above the guide bulge portion 18b causes the guide rod 18 to extend in the directions A and B. Direction (ie,
The rattling of the tape cassette in the tape cassette mounting direction) is effectively suppressed. In the setting state,
The corresponding side of the tape cassette and the pair of guide ridges 17 are not in contact with each other. At this time, the magnetic tape housed in the tape cassette extends between the capstan 93 and the pinch roller 39 which have entered the capstan receiving hole formed in the tape cassette adjacent to the reference hole, and the magnetic head. Follow 38. Next, the recording / reproducing operation member 30 arranged on the front side of the internal partition 19 is
When pushed in the direction of arrow A against the resilience of the biasing torsion coil spring S1, the inclined surface 33a of the locking projection 33 projecting to the back side of the internal partition wall 19 causes the operation member holding plate 70 to move in the longitudinal direction. The inclined surface 72a of the operation member holding plate 70 located substantially at the center is pushed (FIGS. 1 and 3). With this abutting relationship, the forward force of the locking projection 33 in the direction of arrow A is converted into the force in the direction of arrow C by the inclined surface 72a, and the operating member holding plate 70 becomes the elastic force of the biasing torsion coil spring S2. It is moved in the opposite direction of arrow C. The locking projection 33 moves along the inclined surface 72a, and at the most forward position of the operation member holding plate 70, the locking projection 33 rides over the projection 72b of the operation member holding plate 70 and engages with the recess 74c. (Fig. 4). In this state, the locking projection 33 and the projection 72b are restrained from each other by the elastic restoring force of the torsion coil springs S1 and S2, so that the recording / reproducing operation member 30 and the operation member holding plate 70 are both in the displaced position. Retained. When the recording / reproducing operation member 30 advances to the push-in position, the pinch roller 39 supported by the support bracket 32 of the recording / reproducing operation member 30 is pressed against the capstan 93 via the magnetic tape. In this state, the magnetic tape is guided by the magnetic tape guide pieces 34a, 34b.
Of the magnetic head 3 while being positioned in the guide part of the
8 is in contact with the surface. On the other hand, when the operating member holding plate 70 moves in the direction of the arrow C, the switch starting protrusion 75 a provided on the leg 75 of the operating member holding plate 70 causes the lead plate 8 of the motor switch 80.
The inclined surface of the switch follower piece 82b attached to 2 is pushed, and this is pushed in the direction of arrow A. Switch driven part 82b
When is pressed, the tip end side of the lead plate 82 is bent toward the opposing lead plate 83 side, the contacts 82a, 83a attached to both the lead plates 82, 83 come into contact, and the motor switch 80 is closed. In this switch closed state, the recording / reproducing operation member 3 is
0 and the operating member holding plate 70 are in a restraining relationship with each other,
Maintained (FIG. 5: operating member holding plate 70 and switch 80)
See only the relationship). When the motor switch 80 is closed, the motor 90 starts to rotate, and the driven pulley 95 and the capstan gear 96 integral with the driven pulley 95 rotate via the drive pulley 91, and the capstan that supports the capstan gear 96 so as not to relatively rotate. 93 also rotates. The rotation of the capstan gear 96 is
It is transmitted to the large diameter gear 98 of the first intermediate gear member 97 that meshes with this. At this time, the first intermediate gear member 97 is in the first position (position close to the internal partition wall 19) not displaced in the axial direction. Therefore, the rotation of the small-diameter gear 99 that rotates together with the large-diameter gear 98 is transmitted to the take-up reel drive gear 100 that meshes with the large-diameter gear 98, and the take-up reel drive gear 10
The take-up reel driving piece 106 supported on the same axis as 0 rotates. By this rotation, the magnetic tape in the loaded tape cassette is pulled out from the supply reel and wound on the take-up reel. During this time, the capstan 93 is also rotating, and the magnetic tape sandwiched between the capstan 93 located on the upstream side of the magnetic head 38 and the pinch roller 39 that is driven to rotate is the magnetic tape guide pieces 34a, 3d.
It is guided by 4b and runs smoothly along the magnetic head 38. On the other hand, when the recording / reproducing operation member 30 moves forward, the manual operation head 31 is moved to the side of the side opposite to the pinch roller 39.
Spring-shaped bifurcated body 35 located at the most distal end to
Are pressed against the outer peripheral surface of the cylindrical base portion of the supply reel driving piece 105. As a result, the bifurcated body 35 is expanded into an open leg shape, and the elastic restoring force causes a frictional braking force to act on the cylindrical base portion and the supply reel driving portion piece 105 integrated with the cylindrical base portion, and thus the supply reel driving portion. Rearward tension is applied to the magnetic tape pulled out from the piece 105. In this state in which the rear tension is applied and there is no looseness, the stable running of the magnetic tape from the supply reel to the take-up reel is guaranteed. In addition, it should be noted that the biasing force of the torsion coil spring S1 and the elastic restoring force of the bifurcated body 35 act on the recording / reproducing operation member 30 at the side portion on the side opposite to the pinch roller 39. That is the point. As described above, in the state where the locking projection 33 and the projection 72b are restrained from each other,
The recording / reproducing operation member 30 to which the two kinds of forces act, receives these forces, and as a whole, the locking projection 33 and the protrusion 7 are formed.
A slight oscillating movement in the counterclockwise direction (FIG. 4) along the front surface of the internal partition wall 19 is performed with the engaging portion of 2b as a fulcrum. To successfully allow this rocking motion, the opening 37 has a narrow portion and a wide portion. That is, the recording / reproducing operation member 30
Is in the standby position, the narrow portion of the opening 37 is engaged with the hook-shaped locking projection 19a of the internal partition 19 to prevent the recording / reproducing operation member 30 from rattling in the C and D directions. Along with this, the standby position is defined. However, when the recording / reproducing operation member 30 is advanced by the pushing operation, the hook-shaped locking projection 19a is positioned in the wide portion of the opening 37, and the swing motion of the recording / reproducing operation member 30 is allowed. When this swinging movement is performed, the pinch roller 39 located on the opposite side of the bifurcated body 35 with respect to the engaging portion of the locking projection 33 and the protruding portion 72b serves as the capstan 93 with the magnetic tape interposed therebetween. The magnetic tape is pressed against it with a sufficiently large pressure, and the necessary gripping force for the magnetic tape is secured. It should be further noted that the magnetic head 38 and the locking projection 33 are disposed at substantially corresponding positions on both front and back surfaces of the recording / reproducing operation member 30, so that the swinging motion of the recording / reproducing operation member 30 is prevented. Regardless of the presence or absence, the position of the magnetic head 38 when the recording / reproducing operation member 30 is moved forward is substantially constant.

Stopping the recording / reproducing operation: When the recording / reproducing operation member 30 is pushed in, the manual operation head 61 is pushed to move the stop operation member 60 forward against the biasing force of the torsion coil spring S3. Member holding plate 7
When the constraint relationship between 0 and the recording / reproducing operation member 30 is broken, the recording / reproducing operation member 30 is returned to the standby position, the motor switch 80 is opened, and the rotation of the motor 90 is stopped. Details are as follows. When the recording / reproducing operation member 30 is pushed in, the operation member holding plate 7
0 and the stop operation member 60 in the standby position are in the relationship shown in FIG. 5 (FIG. 5 shows the forward movement state of the rewind operation member 50, but the operation member holding plate 70 and the stop operation member 60 are shown.
Is the same as the state in which the recording / reproducing operation member 30 is moved forward). When the stop operating member 60 advances, the protrusion 64 of the stop operating member 60 causes the leg 75 of the operating member holding plate 70 to move.
The operation member holding plate 70 is slightly moved in the direction of arrow C by pushing the inclined surface of the small projecting piece 75b projecting from the. Due to this movement, the locking projection 33 is separated from the recess 74c of the operation member holding plate 70, and goes beyond the projection 72b to stop the locking projection 33 and the projection 7.
The restraint relationship with 2b is broken. As a result, due to the elastic restoring force of the biasing torsion coil spring S1, the recording / reproducing operation member 30 is
Returns to its standby position. On the other hand, the operation member holding plate 70
Also moves in the direction of arrow D to return to the non-actuated position, but this return operation is performed by the protrusion 64 of the stop operation member 60 in the forward transition process and the elongated protrusion 75c provided on the leg 75.
And the switch driven part 82b of the motor switch 80 is kept pressed by the switch activation protrusion 75a, as shown in FIG.
In this state, the lead plate 82 remains bent. However, when the stop operating member 60 moves forward, as shown in FIG. 6, the tip 63 pushes the lead plate 83 to bend it, so that the contact 83a separates from the contact 82a even though the lead plate 82 is bent. As a result, the motor switch 80 is opened. As a result, when the stop operation member 60 is pushed in the recording / reproducing state, the motor switch 80 is immediately closed, and like the conventional similar device,
The disadvantage that the motor switch is not cut off until the operator releases the stop operating member 60 and the stop operating member 60 returns to the standby position is effectively eliminated. Then, when the operator releases the stop operation member 60, the stop operation member 60 is pushed back to the standby position by the elastic restoring force of the torsion coil spring S3, and the operation member holding plate is returned by the elastic restoring force of the torsion coil spring S2. 70 is pushed back to the non-operation standby position. During this time, the protrusion 64 passes along the inclined surface of the elongated protrusion 75c, passes between the small protrusion 75b and the elongated protrusion 75c, and moves in the direction of arrow B. The state where the stop operating member 60 and the operating member holding plate 70 have returned to the standby position is as shown in FIG.

Regarding magnetic tape fast-forward operation: When the manual operation head 41 is pushed and the fast-forward operation member 40 is advanced against the biasing force of the torsion coil spring S2, the inclined surface 42a of the first branch leg 42 holds the operation member. Locking protrusion 7 of plate 70
3, the operating member holding plate 70 also moves in the direction of arrow C against the biasing force of the torsion coil spring S2, and finally the locking projection 73 gets over the projection 42b and engages with the recess 42c. . Due to this engagement relationship and the biasing force of the torsion coil spring S2, the fast-forwarding operation member 40 and the operation member holding plate 70 are constrained to each other, and both members 40, 70 are held at the displacement positions. On the other hand, the movement of the operation member holding plate 70 in the direction of arrow C closes the motor switch 80, which is the same as when the recording / reproducing operation member 30 is operated. The motor 90 is started by closing the motor switch 80, and the capstan gear 96 and the first intermediate gear member 9 are started.
7, the take-up reel drive gear 100, and the take-up reel drive part 106 rotate to wind the magnetic tape on the take-up reel. This operation is the same as the recording / reproducing operation, but unlike the case where the recording / reproducing operation member 30 is moved forward, the pinch roller 39 sandwiches the magnetic tape and the capstan 93.
Since it is not pressed against and the magnetic tape and the magnetic head 38 are not in sliding contact with each other, the load on the drive system is smaller than that during the recording / reproducing operation. A fast-forward operation is performed.

Stopping the magnetic tape fast-forward operation:
When the fast-forwarding operation member 40 is pushed in and the manual operation head 61 is pushed to move the stop operation member 60 forward against the biasing force of the torsion coil spring S3, the operation member holding plate 70 moves slightly in the direction of arrow C. Such a movement breaks the constraint relationship between the operating member holding plate 70 and the fast-forwarding operating member 40, returns the fast-forwarding operating member 40 to the standby position, opens the motor switch 80, and rotates the motor 90 and each rotating member. Stop. The interaction between the stop operation member 60 and the switch opening / closing mechanism of the operation member holding plate 70 leading to this stop is the same as in the case of stopping the recording / reproducing operation. Therefore, an aspect in which the constraint relationship between the fast-forwarding operation member 40 and the operation member holding plate 70 is broken will be described. As described above, the protrusion 64 of the stop operating member 60 that advances by the pushing operation pushes the inclined surface of the small projecting piece 75b protruding from the leg 75 of the operating member holding plate 70, and the operating member holding plate 70 is indicated by the arrow C. When it moves slightly in the direction, the torsion coil spring S2
Along with the movement of the fast-forwarding operation member 40 that tries to return in the direction of arrow B by the urging force of
It separates from c and gets over the protrusion 42b. This breaks the constraint relationship between the fast-forwarding operation member 40 and the operation member holding plate 70, and the fast-forwarding operation member 40 immediately returns to the standby position.

Rewinding operation: manual operation head 5
When 1 is pushed and the rewinding operation member 50 is advanced against the urging force of the torsion coil spring S3, the hook-shaped locking protrusion 54 projecting from the square shoulder portion on the stop operation member 60 side holds the operation member. The inclined surface 74a of the plate 70 is pushed, and the operation member holding plate 70 is moved in the direction of arrow C against the biasing force of the torsion coil spring S2 (FIG. 5). With this movement, the locking projection 54 rides over the projection 74b and engages with the recess 74c. Due to this engagement relationship and the biasing forces of the torsion coil springs S2 and S3,
The rewinding operation member 50 and the operation member holding plate 70 are constrained to each other so that both members 50 and 70 are held at the displacement positions.
The closing of the motor switch 80 in this state where the operation member holding plate 70 has moved in the direction of arrow C is the same as when the recording / reproducing operation member 30 or the fast-forward operation member 40 is operated. Closing the motor switch 80 causes each associated rotary member of the drive system to rotate.
Different from the recording / playback operation and fast-forward operation. This difference is caused by the lift displacement of the first intermediate gear member 97.
The details are given below. In a state before the rewinding operation member 50 is pushed in, the first intermediate gear member 97 is at the first position close to the rear surface of the internal partition wall 19, and means for displacing the first intermediate gear member 97 in the axial direction. The oscillating arm 108 is substantially parallel to the internal partition wall 19 (FIG. 8). At this time, the first branch piece 52 of the rewinding operation member 50 is located away from the swing arm 108 in the arrow B direction, and the second branch piece 53 is located inside the internal partition 19 and the swing arm 108.
Located between. When the rewinding operation member 50 advances, the first branch piece 52 rides on the upper surface of the base region 108c of the swing arm 108, pushes down the base region 108c of the swing arm 108, and swings around the support shafts 107A and 107B. Arm 1
08 swings, and the bending-shaped first arm 108d and second arm 108e, which are the tip portions on the side opposite to the base region 108c, rise. This causes the first intermediate gear member 97 to move to the first
It lifts to a second position displaced from the position (Fig. 9). At this time, the hook-shaped engaging piece 1 of the swing arm 108 is attached to the hook-shaped portion of the hook-shaped stopper projection piece 19c protrudingly provided on the back side of the internal partition wall 19.
The large diameter gear 98 of the first intermediate gear member 97, which is correctly positioned at the second position, is the large diameter gear 98 of the second intermediate gear member 101. Mesh with 102. At the same time, the small diameter gear 99 of the first intermediate gear member 97 causes the take-up reel drive gear 100 to move.
Break away from On the other hand, when the motor switch 80 is closed by the forward movement of the rewinding operation member 50, the motor 90 is activated and the drive pulley 91 → the drive belt 92 → the driven pulley 95 → the capstan gear 96 → the first intermediate gear member. 97
Large-diameter gear 98 → large-diameter gear 1 of the second intermediate gear member 101
The driving force of the motor 90 is transmitted in the order of 02. When the large-diameter gear 102 rotates, the driving force is transmitted to the supply reel drive gear 104 via the small-diameter gear 103 integrated with the large-diameter gear 102, and the supply reel drive part 105 is driven and rotated. As a result, the supply reel of the tape cassette fitted to the supply reel drive unit 105 rotates as the drive side, and the magnetic tape pulled out from the take-up reel is wound up on the supply reel.

Stopping the rewinding operation: When the rewinding operation member 50 is pushed in, the manual operation head 61 is pushed to move the stop operation member 60 forward against the biasing force of the torsion coil spring S3. By slightly moving the operation member holding plate 70 in the C direction, the operation member holding plate 70 is moved.
The restraint relationship between the rewinding operation member 50 and the rewinding operation member 50 is broken, the rewinding operation member 50 returns to the standby position, and the motor
The switch 80 is opened, and the rotation of the motor 90 and each rotary member is stopped. The interaction between the stop operation member 60 and the switch opening / closing mechanism of the rewind operation member 50, which leads to the stop, is the same as in the case of stopping the recording / reproducing operation and the fast-forward operation. Therefore, an aspect in which the constraint relationship between the rewinding operation member 50 and the operation member holding plate 70 is broken will be described. As described above, the projection 64 of the stop operation member 60 that advances by the pushing operation is the leg 7 of the operation member holding plate 70.
When the operation member holding plate 70 is slightly moved in the arrow C direction by pushing the inclined surface of the small projecting piece 75b projecting from the rewinding operation member, the urging force of the torsion coil spring S3 tries to return in the arrow B direction. Along with the movement of 50, the locking projection 54 separates from the recess 74c and rides over the projection 74b. This breaks the constraint relationship between the rewinding operation member 50 and the operation member holding plate 70, and the rewinding operation member 50 immediately returns to the standby position (FIG. 6). At the time of this return, the rewinding operation member 50
The first branch piece 52 of the
The branch piece 53 returns between the swing arm 108 and the internal partition wall 19. The upper surface of the second branch piece 53, which comes into contact with the base region 108c of the swing arm 108 from the lower side, has a ridge shape extending in the advancing and retreating direction, and moreover, the ridge of the ridge on the base side of the second branch piece 53. Since the end portion is an inclined surface that is continuous with the plane of the main body of the rewinding operation member 50, when the second branch piece 53 retracts, the inclined surface of the ridge gradually increases.
Lift 8c. Thus, the swing arm 108 has the support shaft 10
7A and 107B swing around the swing center to move the internal partition 19
Return to the initial posture parallel to. Due to the return movement of the swing arm 108, the first intermediate gear member 97 returns from the raised second position to the initial first position, and the first intermediate gear member 9
The large diameter gear 98 of No. 7 disengages from the large diameter gear 102 of the second intermediate gear member 101, and the small diameter gear 9 of the first intermediate gear member 97.
9 meshes with the take-up reel drive gear 100. By the way, the capstan gear 96, the large-diameter gear 98 of the first intermediate gear member 97, and the large-diameter gear 102 of the second intermediate gear member 101 are all helical gears. The gear teeth of the gears incline toward the rotation front side from the side opposite to the inner partition wall 19 of each gear toward the side facing the inner partition wall 19. Therefore, while they mesh with each other and rotate, the large diameter gear 98 of the first intermediate gear member 97 is
The force in the direction of separating the intermediate gear member 101 from the large-diameter gear 102 is received. Therefore, when the first intermediate gear member 97 returns from the second position to the initial first position due to the return movement of the swing arm 108 due to the stop of the rewinding operation, the respective gears simultaneously stop rotating, but in the disengagement direction. Combined with the action of the force of the first intermediate gear member 97, the first intermediate gear member 97 loses the supporting force of the swing arm 108, and the large-diameter gear 98 easily moves to the second intermediate gear member 101.
The large-diameter gear 102 is disengaged. On the other hand, when the stop operation member 60 is not operated until the rewinding operation of the magnetic tape is completed, the supply reel drive gear 104 and the small diameter gear 103 meshing with the supply reel drive gear 104 also stop at the same time when the rewinding operation is completed (hence, The second intermediate gear member 101 also stops)
However, since the tape recorder of this embodiment does not have the full auto stop mechanism, the motor 90 still tries to continue rotating. Therefore, normally, the second stopped
The large-diameter gear 98 of the first intermediate gear member 97 makes a rotational motion around the meshing portion of the intermediate-gear member 101 with the large-diameter gear 102 as a fulcrum, and is caught between the large-diameter gear 102 and the capstan gear 96. It should tend to try. However, as described above, the rotating first intermediate gear member 97
The large-diameter helical gear 98 is always the second intermediate gear member 101.
The large-diameter gear 98, which receives a rotational force from the drive side after the large-diameter gear 102 of the second intermediate gear member 101 is stopped, receives a force in the direction of disengagement from the helical gear large-diameter gear 102. Combined with the fact that it is made of resin, it slightly bends to the detaching side, that is, the internal partition wall 19 side, and the biting force is alleviated. Therefore, when the rewinding operation member 50 is returned to the standby position by the operation of the stop operation member 60 and the swing arm 108 is returned to the return position, the first intermediate gear member 97 that has lost the supporting force.
The large diameter gear 98 is easily disengaged from the large diameter gear 102.

[0028]

According to the present invention, the following advantages can be obtained. A central frame composed of an outer peripheral frame and an internal partition is formed as an integral resin molded product, the internal partition is used as a drive mechanism supporting chassis, and a pair of guide protrusions and a pair of positioning reference rods are integrally formed with the central frame. By
The number of parts can be reduced and the manufacturing cost can be reduced. By forming a pair of guide protrusions integrally with the resin center frame, when loading the tape cassette, the tape cassette is guided along the guide protrusions so that the position reference holes of the tape cassette are correctly aligned. Can be aligned with the rod. With such a structure, the positioning reference rod can be made sufficiently short. If the positioning reference rod is short,
The work of assembling the tape drive mechanism parts to the inner partition wall as the drive mechanism supporting chassis is simplified, and the damage of the positioning reference rod during the assembling work is reduced due to the strength and the chance of collision between members (parts). . If the pair of guide protrusions is formed along the stepped portion between the outer peripheral frame and the internal partition wall in the resin central frame, it is not necessary to stand the guide protrusions independently on the internal partition wall.
The shape of the drive mechanism support chassis can be simplified compared to the conventional product, it is easy to form, and it is advantageous in terms of strength because it is not likely to be damaged. It is sufficiently long depending on the size of the stepped portion. It is possible to obtain advantages such as being possible. It is effective to give the positioning reference rod a special shape, which means that on the side of the positioning reference rod facing the side opposite to the side where the pair of guide projections are located, Form a bulging shape between the tip and the tape cassette guiding inclined surface between the tip and the intermediate bulging portion, and tilt and retreat from the intermediate bulging portion to the base portion. You can prevent floating. Normally, the loaded tape cassette is spring-biased on the side opposite to the tape running side, and if this tape cassette is pressed against the base of the tilted and retracted positioning reference rod, the above-mentioned floating Preventive effect is obtained.

[Brief description of drawings]

FIG. 1 is a schematic view of a central frame according to an embodiment of the present invention viewed from the front side thereof.

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is a schematic view of the center frame in FIG. 1 viewed from the back side thereof.

4 is a schematic diagram corresponding to FIG. 1, mainly showing a recording / reproducing operation member and an operation member holding plate.

5 is a schematic view of the central frame in FIG. 1 viewed from the rear side thereof, showing a state in which the rewinding operation member is in the forward position.

FIG. 6 is a schematic view of the central frame in FIG. 1 viewed from the back side thereof, showing a state in which a stop operation member is pushed in and is in a forward movement position.

7 is a diagram showing only a drive system arranged on the back side of the central frame in FIG.

8 is a side view showing the relationship between the first intermediate gear member and the second intermediate gear member in the drive system in FIG. 7, with the first intermediate gear member being in the first position.

9 is a side view showing a relationship between a first intermediate gear member and a second intermediate gear member in the drive system in FIG. 7, which is in a second position where the first intermediate gear member is displaced.

FIG. 10 is a vertical cross-sectional view showing a resin bearing arranged in the internal partition wall of the central frame in FIG.

11 is a view taken along the line XI-XI in FIG.

12 is a sectional view taken along line XII-XII in FIG.

FIG. 13 shows a guide / positioning method according to the related art of the tape cassette when the tape cassette is mounted on the tape recorder.

[Explanation of symbols]

 10 Central Frame 11 Peripheral Frame 12 Top Wall 13 Notched Part 14 Raised Wall 15 Stepped Part 16 Window Part 17 Guide Protrusion 18 Guide Rod 18a Tape Cassette Induced Slope 18b Intermediate Swelling 18c Inclined Recess 19 Internal Partition 19a Hook Type Locking projection piece 19b Supporting projection 19c Hook type stopper projection piece 20 Recess 20a Bottom wall 20b Window 21 Bearing holding sleeve 22 Bearing 23 Locking piece 30 Recording / reproducing operation member 31 Manual operation head 32 Support bracket (projection piece) 33 Locking Projection piece 33a Inclined surface 33b Hook-shaped portion 34a, 34b Magnetic tape guide piece 35 2 Crotch-shaped body 36 Projection piece 37 Opening 38 Magnetic head 39 Pinch roller S1 Twisting coil spring for bias 40 Fast-forward operation member 41 Manual operation head 42 First Branch leg 42a Sloping surface 42b Projection portion 42c Recess 43 Second Spread leg 43a Projection piece S2 Energizing torsion coil spring 50 Rewind operation member 51 Manual operation head 52 First branch piece 53 Second branch piece 54 Locking projection piece 55 Projection piece S3 Energizing torsion coil spring 60 Stop operation member 61 Manual operation head 62 Leg 63 Tip 64 Protrusion 65 Projection piece 70 Operating member holding plate 71 Projection piece 72a Inclined surface 72b Projection 72c Recess 73 Locking projection 74 74 Opening 74a Inclined surface 74b Projection 74c Recess 75 Leg 75a Switch Starting protrusion 75b Small protrusion 75c Slender protrusion 80 Motor switch 81 Switch base 82 Lead plate 82a Contact 82b Switch driven part 83 Lead plate 83a Contact 90 Motor 91 Drive pulley 92 Drive belt 93 Capstan 94 Capstan shaft 95 Driven pulley 96 capstan gear 97 1st intermediate gear part 97A support shaft 98 large diameter gear 99 small diameter gear 100 winding reel drive gear 101 second intermediate gear member 101A supporting shaft 102 large diameter gear 103 small diameter gear 104 supply reel drive gear 105 supply reel drive part 106 106 reel drive part 107A, 107B Support shaft 108 Swing arm 108a, 108b Blacket 108c Base region 108d First arm 108e Second arm 108g Hook-shaped locking piece

Claims (4)

[Claims] 1. A tape recorder having a main exterior body including a rear side box body, a central frame, and a front side tape cassette holding lid, wherein the central frame is made of resin and an outer peripheral frame,
It is composed of the outer peripheral frame and an inner partition formed integrally with the outer frame, and the inner partition is used as a drive mechanism supporting chassis to support the tape drive mechanism component, and is fitted into a pair of position reference holes provided in the tape cassette. A pair of positioning reference rods are formed to project integrally with the inner partition wall of the central frame in a substantially right angle posture, and the side edges of the tape cassette to be loaded are guided so that the position reference holes are correctly aligned with the reference rods. A pair of guide protrusions that guide the fitting to each other are integrally formed on the central frame, and the positioning reference rod and the guide protrusions are configured to correctly set the tape cassette. A tape cassette positioning structure for tape recorders. 2. The pair of guide protrusions is formed along a step portion between the outer peripheral frame and the inner partition wall in the central frame.
The tape cassette positioning structure of the tape recorder described in. 3. On the side surface of the positioning reference rod facing the side opposite to the side where the pair of guide protrusions are located, a bulging shape is formed between the base portion and the tip of the positioning reference rod.
There is a tape cassette guiding inclined surface between the tip and the intermediate bulging portion, and the tape cassette is inclined and retracted from the intermediate bulging portion to the base portion
The tape cassette positioning structure for the tape recorder according to claim 1 or 2, characterized in that the tape cassette is prevented from rising after the loading is completed. 4. The tape cassette positioning structure for a tape recorder according to claim 1, wherein the central frame is made of ABS resin or AS resin.